Annotate text that auto fits within an image and benchmark on both graphicsmagick and imagemagick. Uses mini_magick

annotate_image.rb

#!/usr/bin/env ruby

# Convert command line
#
#gm convert -font helvetica -fill white -pointsize 20 -draw "text 500,600 'WALLPAPERZ ARE GOOD'" test.jpg output.jpg
#
#convert -background transparent -fill white -gravity center -size 1024x200 -font Helvetica -pointsize 20 #caption:"I'm a wallpaper, you know what to do" test.jpg +swap -gravity south -composite output.jpg
#
# Mogrify command line
#
#mogrify -font helvetica -fill white -pointsize 20 -gravity center -annotate +0+300 'WOW123' -format png test.jpg
#
#gm mogrify -font helvetica -fill white -pointsize 20 -gravity center -draw "text 0,300 'WOW123'" -format png test.jpg

require 'rubygems'
require 'mini_magick'
require 'benchmark'

#MiniMagick.processor = :gm

def create_image
  #caption = "I LOVE WALLPAPERZ!!!!!1"
  caption = "I HATE IMAGEMAGICK! I HATE IMAGEMAGICK!"
  image = MiniMagick::Image.open("test.jpg")
  image.combine_options do |c|
    c.font "helvetica"
    c.fill "white"
    c.pointsize 20
    c.gravity "center"
    c.draw "text 0,300 '#{caption}'"
  end

  image.write "output.jpg"
end

Benchmark.bm do |r|
  iterations = 1000
  r.report("imagemagick:") {(1..iterations).each { create_image }}
  MiniMagick.processor = :gm
  r.report("graphicsmagick:") {(1..iterations).each { create_image }}
end